As of October 2015, the largest known prime number is 2^57,885,161 − 1, a number with 17,425,170 digits.
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679 is the product of the largest single-digit prime number and the largest two-digit prime number.
The largest five-digit prime number is 99,991.
The largest four-digit prime number is 9973.
97=largest 2 digit prime
It is 97. it is largest, because it is the largest double digit prime number.